not a/not one

From Longman Dictionary of Contemporary Englishnot a/not onenot a/not onenot any person or thingNot one of the students knew the answer.There wasn’t a cloud in the sky.Not a single person said thank you. →not

Examples from the Corpus

not a/not one• But not a one of them was able to stayawake through the night, so they all were beheaded.• This change is not a one way process.